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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1c7eee5a780142a64b09845c1def27275e86dc2fee4dca5d844ca85fb7e1c026' 
  AND token = '9gwmqimlkYzy/pvRr9Jun2RdHnYPv2gwSmmdA+jrHPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}